Skiving machine



Oct. 23, 1928.

E. J. RAY

SKIVING MACHINE Filed Dec; 1'2, ,1922

Patented Get. 23,

I UNITED, srArss 1,588,434 PATENT OFFICE.

EUGENE J. BAY, OF BEVERLY, MASSACHUSETTS, ASSIGIQ'OR TO UNITED MACHITEL, ERY CORPORATION, OF IPATERSOIJ, NE?! JERSEY, A CORPORATION OF NEW JERSEY.

SKIVING MACHINE.

Application filed December 'This invention relates tomachines for operating upon sheet material and isherein described as embodied in a machine for skive ing upper leather and similar material.

A type of leather skiving machine now in use is provided with a tubular knife, a feed roll located partly within the knife near the upper portion of the edge thereof and a presser roll located outside the knife and above the feed roll. It is necessary in such a machine, as in all leather skiving machines, to provide an edge gage for facilitating the proper guiding of the work. i

According to one feature of-the present invention there is provided a having a tapered end" which extends between the rolls close to the bite thereof. With such a construction, as the work is'advanced to the rolls, anygiven point on the edge of the work is engaged substantially up to-the moment it is seized by therolls.

With a gage oft-his kind which has a tapered end extending between the rolls, there is a strong liability, unless provision is made to prevent it, that the drag exerted by the edge of the work upon the gage, as the work is drawn ahead by the rolls, will move the gage toward and into contact with the rolls.

In orderto prevent this undesirable occurrence, as well as to permit the gage tobe moved into and out of operative position without exercise of any particular care on the part of the operator, another feature of. the

invention relates to a stop whiclrcontacts with a' stationary part of the machine andv thereby prevents the gage from being moved into contact with the rolls. r

These and other features of" the invention including certain details of construction and combinations of parts will be described as embodied in an illustrative machine and pointed-out in the appended' claims. v

Referring now toth'e accompanying drawings, f V I i f Fig. 1 is a perspective of a portion of a skiving machine in which the invention is embodied, and

Fig. 2 is a perspective similar to that Fig. 1 but showing a modification.

Referring first to Fig. 1,the frame of'the machine is made in two sections, a main sec tion 3 and a roll-carrying section 5, the latter sectionbeing hinged on a vertical axis (not in Patent No. 1,469,849.

12, 1922. Serial no. 506,446.

sired, to give free access to the knife. The feed roll 7 is mounted in the section 5 in such manner. that it may yield bodily and angularly in a vertical path. The knife 9' is a tubular one carried by a tubular holder 11 which is fast to the outer end of a horizontal shaft rotatable in bearings in the main section 3 of the frame of the machine. The feed roll 7 is located partly within the tubular knife; and co-operating with it is a presser roll 13 which is carried by an arm 15, said arm overhanging the main section 3. said presser roll being rotatedby means of universal joint connection with a small shaft 17. A member 19 the upper surface of which is curved to correspond generally to the curvature of the knife is fast to the .topof the section 5, a portion of the top and the member forming a support or table over which the work is presentedto the rolls- The machine, as thus far described, is old and well known, its mode of operation being as follows. The knife and rolls are rotated continuously, and the work is presented to the rolls, and skived work passing over the knife and the skivings or chips passing into the interior of theknife'and then being directed or carried out of it. i I

The presser roll 13 and its mounting like that disclosed in prior application Ser. N 0.

487,156, filed in my name, which has resulted It is fast to the outer end of a stem 21 which passes through a sleeve 23, the inner end of the stem being. enlarged and provided with a socket to receive the ball 25 of the universal joint which connects the stem with he shaft 17. The sleeve 23 has integral w1th 1t 'a-segmental -rack27 which meshes with a pinion 29 carried by a stub shaft 31. A handhold (not shown) on the farther end of the shaft 31 furnishes a convenient means for turning it, and a lock-nut 33 holds itin adjusted position. With this construction the angle of the scarf may be determined. In order to guide the work to the knife and rolls, there is provided edge gage comprising a base 35, a worl-I-engaging member 87 and a stop 39. The base is prolvidedwith a slot 41 through which. extends the stem of a screw 43 which is threaded into thesection 5. After the screw has been loosened, the

base may be adjusted substantially parallel to the axis of the feed roll 7 i to vary the width of the scarf and may be swung angularly out of operative position if desired. Gne end of the base 35 has a downwardly extending flange which rests upon the member 19; and, near this end are two slots 47. The work-engaging member 37 has a horizontally extending flange provided with two slots 7 which register with the slots 47 in the base 35.

The stems of two headed screws e9 ext-end through these slots and are threaded into the stop 39, said stop consisting of a bar having a downwardly bent-end adapted to contact with the front wall of the section These screws hold the three parts together and per,- mit any one of the three to be adjusted with respect to the other two in the direction of feed of the work. The work-engaging mem ber 37 has a tapered forward end which e2;- tends betweenthe rolls to a point close to the bite thereof, the taper, in the illustrative construction being a double one the faces of which are curved so as to lie close to the bite of the rolls. After the screw 13 has. been loosened, the base'may be adjusted both to determine the width of the scarf and to aline the work-engaging member with the direction of feed movement of the work. After the screws 49 have been loosened, the work-engaging member 37 may be moved until its tapered end is close to the rolls, and the stop 39 may be moved until its downwardly bent portion contacts with the stationary section 5 of the frame. Assuming now that the three screws are tightened the gage will be heldfirmly in the desired position.

The gage shown in Fig. 1 and described above is suitable for use with straight-edged pieces of work and with pieces the edges of which are convexly curved. A gage which is suitable for use with both of these kinds of work, as well as for use with pieces, such as the stiffeners for the visors of caps,.which have concavely curved edges, is shown in Fig. 2. In this form the base 135 has a slot 141 and a clamping screw 14-3 like the corresponding elements of Fig. 1, but the downwardly bent flange at the end nearest the observer is curved. Threaded into the base at two points near its curved edgeare two screws 61,63 each having a washer beneath the head thereof, said screws serving to hold the work-engaging member in adjusted position. This work-engaging member is made of spring steel and is shown as bent around the curved edge of the base 135 in position to guide a piece of work having a concavely curved edge. Integral with the work-engaging member 65 are two horizontally extending projections 67 and 69 the projection67- being provided with an arcuate slot 71 and the projection 69 with straightslot 7 3 extending substantially in the direction of feed movement of the work. After the screws 61, 63 have been loosened, the work-engaging member 65 may be adjusted in two directions, toward and from the rolls and angular-1y in ters Patent of the United States, is:

brought into the position occupied by the corresponding member 37 of Fig. 1 by loosening the screw 61 and swinging the member 65 toward the observer. r Y I Q Although the invention has been set forth as embodied in a particular machine it should be understood that the invention is not limited in the scope of its application to the particular machine which has been shown and described. r

Having thus described my invention, what I claim as new and desire to secure by Let"- 1. A machine of the class described having, in combination, a knife, a pair of rolls for advancing a piece of work to the knife, a gage for guiding the work bylengagement with the edge thereof, saidgage being adjustable toward andfroin'the rolls and-having a double tapered end extending between said rolls to a point closeto the bite thereof, and a stop adapted to contact with a stationary part of the machine to prevent the gage from being pushed into contact with the r0 s. i I r 2. A machine of the classjdescribed having, in combination, a knife, a pair of rolls for advancing a piece of work tothe knife, a table over which the work'is advanced, an edge gage pivoted to the table and astop arranged to engage a stationary part of the machine to limit the extent to which the gage beswung about the pivot toward, the

re s. i 1

3. A machine of the class described having, in combination, a knife, a pair of rolls for advancing a piece of work to the knife, a table over which the work is advanced, and an edge gage pivoted to the table, said gage having a double tapered end the faces of which are curved adapted to extend close to the bite of the rolls.

a. A- machine of the class described having, in combination, a knife, a pairof rolls for advancing apiece of work to theknife, and a gage for guiding the work by engagementwith the edge thereof, said gage comprising a base pivotally and slidably adjustable on a stationary part of the machine,'and a'work-engaging member mounted on the base and adjustable with respect thereto, said gage having a tapered end adapted to close to the bite-of the rolls. r

5. A machine of the class described hav ing, in combination, a knife, a pair of rolls for advancing a piece of work to the knife,

and a gage for guiding the work by engageextend I ment with the edge thereof, said gage com- 1 prising a base pivotally and slidably adjustable on a stationary part of the machine, a

work-engaging member mounted on the base and adjustable with respect thereto, said gage having a tapered end adapted to extend close to the bite of the rolls, and .a stop held from movement with respect to the base and adapted to contact with a stationary part of the machine.

6. A machine of theclass described having, in combination, a tubularknife, a pair of rolls for advancing work to the knife, and an edge gage member having a double tapered end extending into the space between the rolls and adjustable in two directions one substantially parallel to the axes of the rolls and the other substantially parallel'to the direction of feed movement of the work.

20 7. A machine of the class described hav- 8. A machine of the class described hav- 7 ing, in combination, a tubular knife, a driven feed roll located partly within the knife, a driven presser roll located without the knife, said presser roll being angularly adjustable "to vary the angle of thescarf, a gage memher having a double tapered end extending into the space between the rolls, and means gage may be adjusted in two diwhereby said rections.

In testimony whereof I have signed my name to this specification.

EUGENE J. RAY. 

